Kinetics and Mechanism of the Reaction between H₂O₂ and Tungsten Powder in Water

Abstract

In this work, the reaction between H 2 O 2 and tungsten powder in the presence of Tris(hydroxymethyl) aminomethane was studied experimentally. The production of hydroxyl radicals can be quantified indirectly by quantifying the scavenging product formaldehyde (CH 2 O). XRD, XPS, and SEM analysis shows that no significant structural or compositional changes occur after reaction. We compared H 2 O 2 consumption and CH 2 O formation in both heterogeneous W (s) /H 2 O 2 /Tris system and homogeneous W (aq) /H 2 O 2 /Tris system. Increasing the amount of W powder leads to the increase in dissolution rate of W species, insignificant increase of H 2 O 2 consumption rate and the decrease of final CH 2 O production. By contrast, the consumption rate of H 2 O 2 increases as increasing the concentration of dissolved W species. Based on the experimental results, a mechanism of H 2 O 2 reacting with W powder in the presence of Tris is proposed. The mechanism well explained the relationship between surface reactions and homogeneous Haber−Weiss peroxide chain breakdown.

Highly ordered Nanomaterial Functionalized Copper Schiff Base Framework: Synthesis, Characterization, and Hydrogen Peroxide Decomposition Performance

“…Schiff base ligands are able to easily attach metal ions and to stabilize them in order to create highly stable coordination compounds [45][46][47][48][49][50]. Due to the biological essential activity of copper, its coordination chemistry has received significant attention.…”

Kinetic and Mechanistic Study on Catalytic Decomposition of Hydrogen Peroxide on Carbon-Nanodots/Graphitic Carbon Nitride Composite

“…H 2 O 2 is one of the most common sources of HO• in the presence of metal salt solution, carbon-based species, metal or metal oxide via Fenton/Fenton-like reaction, electron-transfer mechanism or catalytic decomposition on the solid-liquid interface [18,[20][21][22][23][24]. The well-known Fenton/Fenton-like reaction may occur in both homogeneous and heterogeneous system according to many works [18,[20][21][22][23]. Similar to the Fenton reaction, HO• and HO 2 • can be formed on the surface of carbon-based catalysts via the electron-transfer mechanism due to the donor-acceptor properties of the carbon surface.…”

“…The redox cycle is necessary to keep the production of HO• and HO 2 • species [24]. The catalytic decomposition of H 2 O 2 on the surface of metal or metal oxides has also been studied to some extent in recent years, including Fe, W, Cu, UO 2 , ZrO 2 , CuO, CuO 2 and so on [18,22,[25][26][27]. It is known that HO• and HO 2 • will be formed as intermediates during the decomposition of H 2 O 2 while the disproportion reaction of HO 2 • ends up with H 2 O 2 and O 2 .…”

Kinetic and Mechanistic Study of Rhodamine B Degradation by H2O2 and Cu/Al2O3/g-C3N4 Composite

“…This result reconfirmed the existence of HO• as main reactive species. Additionally, the characteristic spectrum of DMPO-O2• − with a relative In some systems the dissolved metal species could form certain complexes that are able to catalyze the decomposition of H 2 O 2 , thereby persistently generating HO• [36,68]. To determine the effect of dissolved copper species on Rh B degradation, the suspension containing Cu/Al 2 O 3 /CN composite was filtered at 40 min to remove catalyst particles, and the residual Rh B in the filtrate was monitored over time.…”

“…Generally, the absorbance of Rh B was measured at 555 nm in which Rh B had the maximum absorption. The concentration of H 2 O 2 was determined by the Ghormley triiodide method reported in previous work [68]. The I − could be oxidized by H 2 O 2 to form I 3 − in the presence of catalyst (NH 4 ) 2 Mo 2 O 7 (ADM).…”